Hi Stewart and Welcome to NeuroTalk. I don't know much about TN, but I know someone who also suffers from it and she also has stated that she prays she never has another attack. She carries med in a little necklace around her neck in case an attack comes on.
I hope you can find some info and comfort here. This is a great place and everyone here is so kind and helpful. Let us know if we can help in any way.